JP4621798B1 - Radio base station and communication control method - Google Patents

Radio base station and communication control method Download PDF

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JP4621798B1
JP4621798B1 JP2009256484A JP2009256484A JP4621798B1 JP 4621798 B1 JP4621798 B1 JP 4621798B1 JP 2009256484 A JP2009256484 A JP 2009256484A JP 2009256484 A JP2009256484 A JP 2009256484A JP 4621798 B1 JP4621798 B1 JP 4621798B1
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base station
radio base
interference
radio
information
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JP2012147041A (en
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智春 山▲崎▼
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Kyocera Corp
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Priority to KR1020127012080A priority patent/KR20120066072A/en
Priority to JP2011539425A priority patent/JPWO2011055842A1/en
Priority to EP10828400.1A priority patent/EP2501168A4/en
Priority to US13/508,684 priority patent/US8971952B2/en
Priority to CN2010800495803A priority patent/CN102598749A/en
Priority to PCT/JP2010/069917 priority patent/WO2011055842A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
    • H04L5/0035—Resource allocation in a cooperative multipoint environment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/0073—Allocation arrangements that take into account other cell interferences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244—Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/20—Interfaces between hierarchically similar devices between access points

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

【課題】無線通信システム全体の通信容量の低下を防止することが可能とする。
【解決手段】第２無線基地局１Ｂは、第１無線基地局１Ａからのリソースブロック毎の干渉情報と、トラフィック量比率とを受信する。次に、第２無線基地局１Ｂは、受信したトラフィック量比率に基づいて、同様に受信したリソースブロック毎の干渉情報を補正する。更に、第２無線基地局１Ｂは、補正後のリソースブロック毎の干渉情報に基づいて、無線端末２Ｂの送信電力を制御する。
【選択図】図３It is possible to prevent a reduction in communication capacity of an entire wireless communication system.
A second radio base station 1B receives interference information for each resource block and a traffic amount ratio from the first radio base station 1A. Next, the second radio base station 1B corrects similarly received interference information for each resource block based on the received traffic volume ratio. Furthermore, the second radio base station 1B controls the transmission power of the radio terminal 2B based on the corrected interference information for each resource block.
[Selection] Figure 3

Description

本発明は、他の無線基地局に接続する無線端末から受ける干渉を制御する無線基地局、及び、当該無線基地局における通信制御方法に関する。   The present invention relates to a radio base station that controls interference received from a radio terminal connected to another radio base station, and a communication control method in the radio base station.

無線通信システムにおいて、無線端末から接続先の無線基地局に対する上り方向の無線通信が行われる場合、周辺の無線基地局が無線端末から受ける干渉を制御することが行われている（例えば、特許文献１参照）。   In a wireless communication system, when uplink wireless communication from a wireless terminal to a connected wireless base station is performed, interference received from wireless terminals by surrounding wireless base stations is controlled (for example, Patent Documents). 1).

３ＧＰＰの規格であるＬＴＥ（Long Term Evolution）においても、同様である。ＬＴＥでは、無線基地局間で、ＯＩ（Overload Indicator）と称される干渉状況に関する情報をやりとりすることによって、１の無線基地局が、周辺の無線基地局に接続する無線端末から受ける干渉（周辺セルからの上り方向の干渉）を制御することが想定されている。   The same applies to LTE (Long Term Evolution), which is a 3GPP standard. In LTE, by exchanging information about an interference state called OI (Overload Indicator) between radio base stations, one radio base station receives interference (peripheral) received from radio terminals connected to the neighboring radio base stations. It is assumed that the uplink interference from the cell) is controlled.

具体的には、１の無線基地局は、リソースブロック（ＲＢ）と称される無線リソース単位で、周辺セルからの上り方向の干渉電力を測定し、当該干渉電力に応じて、「干渉が小さい」、「干渉が大きい」、「干渉が非常に大きい」といった３値の情報を周辺の無線基地局へ送信する。この３値情報を受信した周辺の無線基地局は、当該３値情報を用いて、接続している無線端末における送信電力（上り方向の送信電力）の制御を行うことができる。例えば、周辺の無線基地局は、干渉電力が「非常に大きい」との情報を受信した場合には、上り方向の送信電力を下げるように、無線端末の制御を行い、１の無線基地局における上り方向の干渉電力を低減させる。   Specifically, one radio base station measures the interference power in the uplink direction from neighboring cells in units of radio resources called resource blocks (RBs), and determines that “the interference is small” according to the interference power. ”,“ Interference is large ”, and“ Interference is very large ”are transmitted to the neighboring radio base stations. The neighboring radio base stations that have received the ternary information can control the transmission power (uplink transmission power) in the connected radio terminal using the ternary information. For example, if the neighboring radio base station receives information that the interference power is “very high”, the radio base station controls the radio terminal so as to reduce the transmission power in the uplink direction. Reduce interference power in the upstream direction.

特開平５−３００２２号公報JP-A-5-30022

しかしながら、無線通信の負荷の分散のために、種類の異なる基地局を大量に配置するヘテロジーニアスの無線通信システムやマイクロセルの無線通信システム等が構成される場合、全ての基地局において均等にトラフィックが発生するとは限らず、いくつかの基地局ではトラフィックが非常に小さいというような状況が考えられる。このようなトラフィックが非常に小さい基地局が、上述したように、周辺セルからの上り方向の干渉電力のみに従って、ＯＩを送信すると、周辺の無線基地局が、上り方向の送信電力を下げる制御を行ってしまう場合があり、無線通信システム全体の通信容量の低下を招く可能性がある。 However, if a heterogeneous radio communication system or a micro-cell radio communication system in which a large number of different types of base stations are arranged in order to distribute the load of radio communication, traffic is evenly distributed in all base stations. However, there are cases where traffic is very small at some base stations. As described above, when a base station with very small traffic transmits OI according to only the uplink interference power from the neighboring cells, the neighboring radio base stations perform control to reduce the uplink transmission power. There is a possibility that the communication capacity of the entire wireless communication system is reduced.

そこで、本発明は、無線通信システム全体の通信容量の低下を防止することが可能な無線基地局及び通信制御方法を提供することを目的とする。   Therefore, an object of the present invention is to provide a radio base station and a communication control method capable of preventing a reduction in communication capacity of the entire radio communication system.

上述した課題を解決するために、本発明は以下のような特徴を有している。まず、本発明の第１の特徴は、接続している無線端末（無線端末２Ｂ）が他の無線基地局（第１無線基地局１Ａ）に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局（第２無線基地局１Ｂ）であって、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信する受信部（受信処理部１６０）と、 前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて前記無線端末の送信電力を制御する送信電力制御部（無線端末送信電力制御部１６２）とを備えることを要旨とする。 In order to solve the above-described problems, the present invention has the following features. First, the first feature of the present invention is that the other radio base station receives interference caused by the connected radio terminal (radio terminal 2B) to another radio base station (first radio base station 1A). a radio base station (second radio base station 1B) controlled based on the interference information which is information related to the power, and the interference information from the other radio base station, from the other radio base station A receiving unit (reception processing unit 160) that receives load information indicating a load of radio communication in the other radio base station, and received by the receiving unit according to the load information received by the receiving unit The gist of the present invention is to include a transmission power control unit (radio terminal transmission power control unit 162) that corrects the interference information and controls transmission power of the wireless terminal based on the corrected interference information .

このような無線基地局は、自無線基地局に接続している無線端末によって他の無線基地局が受ける干渉電力に関連する干渉情報を受信するのみならず、他の無線基地局における無線通信の負荷を示す負荷情報をも受信し、干渉情報と負荷情報とに基づいて、自無線基地局に接続している無線端末の送信電力を制御する。すなわち、無線基地局は、干渉情報の送信元である他の無線基地局における無線通信の負荷を考慮して、他の無線基地局に干渉を与えている無線端末の送信電力を制御することが可能となり、送信電力が低下することによる無線通信システム全体の通信容量の低下を防止することが可能となる。 Such a radio base station not only receives interference information related to interference power received by other radio base stations by radio terminals connected to the radio base station, but also performs radio communication in other radio base stations. Load information indicating the load is also received, and the transmission power of the radio terminal connected to the own radio base station is controlled based on the interference information and the load information. That is, the radio base station can control the transmission power of the radio terminal that interferes with the other radio base station in consideration of the load of radio communication in the other radio base station that is the source of the interference information. This makes it possible to prevent a reduction in communication capacity of the entire wireless communication system due to a decrease in transmission power.

本発明の第２の特徴は、前記送信電力制御部は、前記干渉情報について、前記負荷情報によって示される無線通信の負荷が小さいほど、干渉電力が小さいことを示すように補正し、補正した干渉情報に基づいて、前記無線端末の送信電力を制御することを要旨とする。 According to a second aspect of the present invention, the transmission power control unit corrects the interference information to indicate that the interference power is smaller as the load of wireless communication indicated by the load information is smaller, and the corrected interference. The gist is to control the transmission power of the wireless terminal based on the information.

本発明の第３の特徴は、前記送信電力制御部は、前記負荷情報によって示される前記無線通信の負荷を示す値が所定の閾値以下である場合に、前記干渉情報を、実際の干渉電力よりも低い干渉電力を示すように補正し、補正した干渉情報に基づいて、前記無線端末の送信電力を制御することを要旨とする。 A third feature of the present invention is that the transmission power control unit determines that the interference information is obtained from actual interference power when a value indicating the load of the wireless communication indicated by the load information is equal to or less than a predetermined threshold. The main point is to correct the transmission power of the wireless terminal based on the corrected interference information.

本発明の第４の特徴は、前記干渉情報は、所定の周波数帯域の無線リソースにおける干渉電力を示すことを要旨とする。   The gist of the fourth feature of the present invention is that the interference information indicates interference power in a radio resource in a predetermined frequency band.

本発明の第５の特徴は、前記干渉情報は、前記他の無線基地局に接続している他の無線端末に割り当てられた無線リソースにおける最小割り当て単位毎の干渉電力を示すことを要旨とする。   A fifth feature of the present invention is summarized in that the interference information indicates interference power for each minimum allocation unit in a radio resource allocated to another radio terminal connected to the other radio base station. .

本発明の第６の特徴は、接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局における通信制御方法であって、前記無線基地局が、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信するステップと、前記無線基地局が、前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて前記無線端末の送信電力を制御するステップとを備えることを要旨とする。本発明の第７の特徴は、接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局であって、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信する受信部と、前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて前記無線端末の送信電力の大きさを制御する送信電力制御部とを備えることを要旨とする。本発明の第８の特徴は、接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局における通信制御方法であって、前記無線基地局が、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信するステップと、前記無線基地局が、受信された前記負荷情報に応じて、受信された前記干渉情報を補正し、補正した干渉情報に基づいて、前記無線端末の送信電力の大きさを制御するステップとを備えることを要旨とする。 According to a sixth aspect of the present invention, a radio that controls interference that a connected radio terminal gives to another radio base station based on interference information that is information related to interference power received by the other radio base station. A communication control method in a base station, wherein the radio base station indicates the interference information from the other radio base station and a load of radio communication in the other radio base station from the other radio base station. Receiving the load information, and the radio base station corrects the interference information received by the receiving unit according to the load information received by the receiving unit, and based on the corrected interference information And a step of controlling transmission power of the wireless terminal. According to a seventh aspect of the present invention, a radio that controls interference that a connected radio terminal gives to another radio base station based on interference information that is information related to interference power received by the other radio base station. A reception unit that receives the interference information from the other radio base station and load information indicating a load of radio communication in the other radio base station from the other radio base station; Transmission power control for correcting the interference information received by the receiving unit according to the load information received by the receiving unit and controlling the magnitude of the transmission power of the wireless terminal based on the corrected interference information It is a summary to provide a part. According to an eighth aspect of the present invention, a radio that controls interference that a connected radio terminal gives to another radio base station based on interference information that is information related to interference power received by the other radio base station. A communication control method in a base station, wherein the radio base station indicates the interference information from the other radio base station and a load of radio communication in the other radio base station from the other radio base station. Receiving the load information, and the radio base station corrects the received interference information according to the received load information, and based on the corrected interference information, the transmission power of the radio terminal And a step of controlling the size.

本発明によれば、無線通信システム全体の通信容量の低下を防止することが可能となる。   According to the present invention, it is possible to prevent a reduction in communication capacity of the entire wireless communication system.

本発明の実施形態に係る無線通信システムの全体概略構成図である。1 is an overall schematic configuration diagram of a wireless communication system according to an embodiment of the present invention. 本発明の実施形態に係る第１無線基地局の構成図である。It is a block diagram of the 1st radio base station which concerns on embodiment of this invention. 本発明の実施形態に係る第２無線基地局の構成図である。It is a block diagram of the 2nd wireless base station which concerns on embodiment of this invention. 本発明の実施形態に係る第１無線基地局の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the 1st radio base station which concerns on embodiment of this invention. 本発明の実施形態に係る第２無線基地局の動作を示すフローチャートである。It is a flowchart which shows operation | movement of the 2nd wireless base station which concerns on embodiment of this invention.

次に、図面を参照して、本発明の実施形態を説明する。具体的には、（１）無線通信システムの構成、（２）無線基地局の動作、（３）作用・効果、（４）その他の実施形態について説明する。以下の実施形態における図面の記載において、同一又は類似の部分には同一又は類似の符号を付している。   Next, an embodiment of the present invention will be described with reference to the drawings. Specifically, (1) the configuration of the radio communication system, (2) the operation of the radio base station, (3) the operation and effect, and (4) other embodiments will be described. In the description of the drawings in the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

（１）無線通信システムの構成
（１．１）無線通信システムの全体概略構成
図１は、本発明の実施形態に係る無線通信システム１０の全体概略構成図である。無線通信システム１０は、例えば、第３．９世代（３．９Ｇ）携帯電話システムであるLTE Release9 や、第４世代（４Ｇ）携帯電話システムとして位置づけられているLTE-Advancedに基づく構成を有する。 (1) Configuration of Radio Communication System (1.1) Overall Schematic Configuration of Radio Communication System FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to an embodiment of the present invention. The wireless communication system 10 has, for example, a configuration based on LTE Release 9 which is a 3.9th generation (3.9G) mobile phone system and LTE-Advanced which is positioned as a 4th generation (4G) mobile phone system.

図１に示すように、無線通信システム１０は、セル３Ａを形成する第１無線基地局１Ａと、セル３Ｂを形成する第２無線基地局１Ｂとを有する。セル３Ａ及び３Ｂの半径は、例えば数百［ｍ］程度である。第１無線基地局１Ａには、セル３Ａ内に存在する無線端末２Ａが接続しており、第２無線基地局１Ｂには、セル３Ｂ内に存在する無線端末２Ｂが接続している。   As shown in FIG. 1, the radio communication system 10 includes a first radio base station 1A that forms a cell 3A and a second radio base station 1B that forms a cell 3B. The radius of the cells 3A and 3B is, for example, about several hundreds [m]. A radio terminal 2A existing in the cell 3A is connected to the first radio base station 1A, and a radio terminal 2B existing in the cell 3B is connected to the second radio base station 1B.

第１無線基地局１Ａ及び第２無線基地局１Ｂは、通信事業者がセル間干渉を考慮した置局設計に基づく場所に設置される。   The first radio base station 1A and the second radio base station 1B are installed at a location based on a station design in which a communication carrier considers inter-cell interference.

第１無線基地局１Ａと第２無線基地局１Ｂとの間は、図示しない専用線等によって接続され、トランスポート層の論理的な伝送路であるＸ２コネクションが確立されている。   The first radio base station 1A and the second radio base station 1B are connected by a dedicated line (not shown) or the like, and an X2 connection that is a logical transmission path in the transport layer is established.

第１無線基地局１Ａは、無線端末２Ａに対して、最小割り当て単位の無線リソースである上り方向及び下り方向のリソースブロック（ＲＢ：Resource Block）を１又は複数割り当て、当該無線端末２Ａとの間で無線通信を行う。同様に、第２無線基地局１Ｂは、無線端末２Ｂに対して、上り方向及び下り方向のリソースブロックを１又は複数割り当て、当該無線端末２Ｂとの間で無線通信を行う。   The first radio base station 1A allocates one or a plurality of uplink and downlink resource blocks (RB: Resource Block), which are radio resources in the minimum allocation unit, to the radio terminal 2A, and between the radio terminal 2A and the radio terminal 2A. Wireless communication with Similarly, the second radio base station 1B allocates one or a plurality of uplink and downlink resource blocks to the radio terminal 2B, and performs radio communication with the radio terminal 2B.

第１無線基地局１Ａと無線端末２Ａとが接続して無線通信を行っている場合における、当該無線通信に用いられる上りリンク（無線端末２Ａから第１無線基地局１Ａに向かうリンクであり、以下、「第１上りリンク」と称する）に対応するリソースブロックの周波数帯域と、第２無線基地局１Ｂと無線端末２Ｂとが接続して無線通信を行っている場合における、当該無線通信に用いられる上りリンク（無線端末２Ｂから第２無線基地局１Ｂに向かうリンクであり、以下、「第２上りリンク」と称する）に対応するリソースブロックの周波数帯域とが同一である場合、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号によって、無線端末２Ａと無線通信を行っている第１無線基地局１Ａは干渉を受けることになる。   When the first wireless base station 1A and the wireless terminal 2A are connected to perform wireless communication, the uplink used for the wireless communication (the link from the wireless terminal 2A to the first wireless base station 1A, , Referred to as “first uplink”) and used for wireless communication when the second wireless base station 1B and the wireless terminal 2B are connected to perform wireless communication. When the frequency band of the resource block corresponding to the uplink (link from the radio terminal 2B to the second radio base station 1B and hereinafter referred to as “second uplink”) is the same, the radio terminal 2B The first radio base station 1A performing radio communication with the radio terminal 2A is subject to interference by the radio signal transmitted to the second radio base station 1B using the second uplink. That.

本実施形態では、上述したように、第１無線基地局１Ａが無線端末２Ｂから干渉を受ける場合に、第１無線基地局１Ａは、第２無線基地局１Ｂに対して、無線端末２Ｂの送信電力の制御を要求し、第２無線基地局１Ｂは、当該要求に応じて、無線端末２Ｂの送信電力を制御することによって、干渉を低減させる。   In the present embodiment, as described above, when the first radio base station 1A receives interference from the radio terminal 2B, the first radio base station 1A transmits the radio terminal 2B to the second radio base station 1B. Requesting control of power, the second radio base station 1B reduces the interference by controlling the transmission power of the radio terminal 2B in response to the request.

（１．２）第１無線基地局１Ａの構成
図２は、第１無線基地局１Ａの構成を示すブロック図である。図２に示すように、第１無線基地局１Ａは、制御部１０２、記憶部１０３、有線通信部１０４、無線通信部１０５及びアンテナ部１０７を有する。 (1.2) Configuration of First Radio Base Station 1A FIG. 2 is a block diagram showing a configuration of the first radio base station 1A. As illustrated in FIG. 2, the first radio base station 1A includes a control unit 102, a storage unit 103, a wired communication unit 104, a radio communication unit 105, and an antenna unit 107.

制御部１０２は、例えばＣＰＵによって構成され、第１無線基地局１Ａが具備する各種機能を制御する。記憶部１０３は、例えばメモリによって構成され、第１無線基地局１Ａにおける制御などに用いられる各種情報を記憶する。   The control unit 102 is configured by a CPU, for example, and controls various functions provided in the first radio base station 1A. The storage unit 103 is configured by a memory, for example, and stores various information used for control and the like in the first radio base station 1A.

有線通信部１０４は、第２無線基地局１Ｂとの間で、データの送信及び受信を行う。無線通信部１０５は、例えば無線周波数（ＲＦ）回路やベースバンド（ＢＢ）回路等を用いて構成され、アンテナ部１０７を介して、無線端末２Ａとの間で、無線信号の送信及び受信を行う。また、無線通信部１０５は、送信信号の符号化及び変調と、受信信号の復調及び復号とを行う。更には、無線通信部１０５は、受信信号の復調及び復号によって得られた受信データを制御部１０２へ出力する。   The wired communication unit 104 transmits and receives data to and from the second radio base station 1B. The wireless communication unit 105 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, and the like, and transmits and receives a wireless signal to and from the wireless terminal 2A via the antenna unit 107. . In addition, the wireless communication unit 105 performs encoding and modulation of a transmission signal and demodulation and decoding of a reception signal. Further, the wireless communication unit 105 outputs received data obtained by demodulating and decoding the received signal to the control unit 102.

無線通信部１０５は、干渉電力測定部１５０を有する。制御部１０２は、通信負荷測定部１５２、干渉情報生成部１５４及び送信処理部１５６を有する。   The wireless communication unit 105 includes an interference power measurement unit 150. The control unit 102 includes a communication load measurement unit 152, an interference information generation unit 154, and a transmission processing unit 156.

無線通信部１０５内の干渉電力測定部１５０は、無線端末２Ａから第１上りリンクを用いて送信される無線信号を受信している間に、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号によって受ける干渉の電力を測定する。具体的には、干渉電力測定部１５０は、受信した無線信号のうち、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号の成分についての電力を、無線端末２Ａに割り当てられた１又は複数のリソースブロック毎に測定する。   The interference power measurement unit 150 in the radio communication unit 105 receives the second radio signal from the radio terminal 2B to the second radio base station 1B while receiving a radio signal transmitted from the radio terminal 2A using the first uplink. The power of interference received by the radio signal transmitted using the uplink is measured. Specifically, the interference power measurement unit 150 uses, as a radio signal, a power of a radio signal component transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink among the received radio signals. Measurement is performed for each of one or a plurality of resource blocks allocated to the terminal 2A.

制御部１０２内の通信負荷測定部１５２は、第１無線基地局１Ａにおける処理可能な最大のトラフィック量に対する、実際のトラフィック量の比率（トラフィック量比率）を、第１無線基地局１Ａにおける無線通信の負荷を示す値として算出する。具体的には、通信負荷測定部１５２は、制御部１０２から無線通信部１０５へ出力される送信データの量を測定する。更に、通信負荷測定部１５２は、測定した送信データ量を、予め定められている処理可能な最大の下り方向のトラフィック量で除算することにより、トラフィック量比率を算出する。あるいは、通信負荷測定部１５２は、無線通信部１０５から制御部１０２へ出力される受信データの量を測定する。更に、通信負荷測定部１５２は、測定した受信データ量を、予め定められている処理可能な最大の上り方向のトラフィック量で除算することにより、トラフィック量比率を算出する。   The communication load measuring unit 152 in the control unit 102 determines the ratio of the actual traffic volume (traffic volume ratio) to the maximum traffic volume that can be processed in the first radio base station 1A, and the radio communication in the first radio base station 1A. Is calculated as a value indicating the load. Specifically, the communication load measuring unit 152 measures the amount of transmission data output from the control unit 102 to the wireless communication unit 105. Further, the communication load measuring unit 152 calculates the traffic amount ratio by dividing the measured transmission data amount by the predetermined maximum downlink traffic amount that can be processed. Alternatively, the communication load measuring unit 152 measures the amount of received data output from the wireless communication unit 105 to the control unit 102. Further, the communication load measuring unit 152 calculates a traffic volume ratio by dividing the measured received data volume by a predetermined maximum traffic volume that can be processed in the uplink direction.

処理可能な最大の下り方向のトラフィック量や、処理可能な最大の上り方向のトラフィック量は、記憶部１０３に記憶されている。更には、通信負荷測定部１５２は、算出したトラフィック量比率を、第１無線基地局１Ａと無線端末２Ａとの間の無線通信において要求されるスループットや、要求されるデータ量が大きいほど、大きくなるように補正してもよい。   The maximum downlink traffic volume that can be processed and the maximum uplink traffic volume that can be processed are stored in the storage unit 103. Furthermore, the communication load measuring unit 152 increases the calculated traffic volume ratio as the throughput required in the wireless communication between the first radio base station 1A and the radio terminal 2A and the required data volume increase. You may correct | amend so that it may become.

制御部１０２内の干渉情報生成部１５４は、干渉電力測定部１５０によって測定された、リソースブロック毎の干渉電力値に基づいて、ＯＩ（Overload Indicator）としてのリソースブロック毎の干渉情報を生成する。具体的には、干渉情報生成部１５４は、リソースブロック毎の干渉電力値が大きいほど、対応するリソースブロック毎の干渉情報の値を大きくする。   The interference information generation unit 154 in the control unit 102 generates interference information for each resource block as an OI (Overload Indicator) based on the interference power value for each resource block measured by the interference power measurement unit 150. Specifically, the interference information generation unit 154 increases the value of the interference information for each corresponding resource block as the interference power value for each resource block increases.

制御部１０２内の送信処理部１５６は、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号に対応する受信データに含まれる、無線信号の送信元である無線端末２Ｂの識別情報と、送信先である第２無線基地局１Ｂの識別情報とを抽出する。次に、送信処理部１５６は、干渉情報生成部１５４によって生成された、リソースブロック毎の干渉情報に、当該干渉情報に対応するリソースブロックの識別情報と、抽出した無線端末２Ｂの識別情報とを付加する。また、送信処理部１５６は、リソースブロック毎の干渉情報と、通信負荷測定部１５２によって算出されたトラフィック量比率を示す情報（負荷情報）とのそれぞれについて、送信先を、抽出した第２無線基地局１Ｂの識別情報に設定し、前記干渉情報及び前記トラフィック量比率を示す情報を、有線通信部１０４を介して、第２無線基地局１Ｂへ送信する。   The transmission processing unit 156 in the control unit 102 is a transmission source of a radio signal included in reception data corresponding to a radio signal transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink. The identification information of the radio terminal 2B and the identification information of the second radio base station 1B that is the transmission destination are extracted. Next, the transmission processing unit 156 adds the identification information of the resource block corresponding to the interference information and the extracted identification information of the wireless terminal 2B to the interference information for each resource block generated by the interference information generation unit 154. Append. Also, the transmission processing unit 156 extracts the transmission destination for each of the interference information for each resource block and the information (load information) indicating the traffic volume ratio calculated by the communication load measurement unit 152. The identification information of the station 1B is set, and the information indicating the interference information and the traffic volume ratio is transmitted to the second radio base station 1B via the wired communication unit 104.

（１．３）第２無線基地局１Ｂの構成
図３は、第２無線基地局１Ｂの構成を示すブロック図である。図３に示すように、第２無線基地局１Ｂは、制御部１１２、記憶部１１３、有線通信部１１４、無線通信部１１５及びアンテナ部１１７を有する。 (1.3) Configuration of Second Radio Base Station 1B FIG. 3 is a block diagram showing the configuration of the second radio base station 1B. As illustrated in FIG. 3, the second radio base station 1B includes a control unit 112, a storage unit 113, a wired communication unit 114, a radio communication unit 115, and an antenna unit 117.

制御部１１２は、例えばＣＰＵによって構成され、第２無線基地局１Ｂが具備する各種機能を制御する。記憶部１１３は、例えばメモリによって構成され、第２無線基地局１Ｂにおける制御などに用いられる各種情報を記憶する。   The control unit 112 is configured by a CPU, for example, and controls various functions provided in the second radio base station 1B. The storage unit 113 is configured by a memory, for example, and stores various information used for control and the like in the second radio base station 1B.

有線通信部１１４は、第１無線基地局１Ａとの間で、データの送信及び受信を行う。無線通信部１１５は、例えば無線周波数（ＲＦ）回路やベースバンド（ＢＢ）回路等を用いて構成され、アンテナ部１１７を介して、無線端末２Ｂとの間で、無線信号の送信及び受信を行う。また、無線通信部１１５は、送信信号の符号化及び変調と、受信信号の復調及び復号とを行う。更には、無線通信部１１５は、受信信号の復調及び復号によって得られた受信データを制御部１１２へ出力する。   The wired communication unit 114 transmits and receives data to and from the first radio base station 1A. The wireless communication unit 115 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, or the like, and transmits and receives a wireless signal to and from the wireless terminal 2B via the antenna unit 117. . In addition, the wireless communication unit 115 performs encoding and modulation of the transmission signal and demodulation and decoding of the reception signal. Further, the wireless communication unit 115 outputs received data obtained by demodulating and decoding the received signal to the control unit 112.

制御部１１２は、受信処理部１６０及び無線端末送信電力制御部１６２を有する。   The control unit 112 includes a reception processing unit 160 and a wireless terminal transmission power control unit 162.

制御部１１２内の受信処理部１６０は、有線通信部１１４を介して、第１無線基地局１Ａからのリソースブロック毎の干渉情報と、トラフィック量比率を示す情報とを受信する。   The reception processing unit 160 in the control unit 112 receives the interference information for each resource block from the first radio base station 1A and information indicating the traffic amount ratio via the wired communication unit 114.

制御部１１２内の無線端末送信電力制御部１６２は、受信処理部１６０によって受信されたリソースブロック毎の干渉情報を、受信処理部１６０によって受信されたトラフィック量比率を示す情報に基づいて補正する。   The wireless terminal transmission power control unit 162 in the control unit 112 corrects the interference information for each resource block received by the reception processing unit 160 based on the information indicating the traffic amount ratio received by the reception processing unit 160.

具体的には、無線端末送信電力制御部１６２は、トラフィック量比率が第１の閾値以上である場合に、リソースブロック毎の干渉情報の値を１だけ小さい値に補正する。   Specifically, the radio terminal transmission power control unit 162 corrects the value of the interference information for each resource block to a value smaller by 1 when the traffic volume ratio is equal to or greater than the first threshold.

更に、無線端末送信電力制御部１６２は、リソースブロック毎の干渉情報（補正された場合には補正後の干渉情報）に基づいて、無線端末２Ｂの送信電力を制御する。具体的には、無線端末送信電力制御部１６２は、受信処理部１６０によって受信された、リソースブロック毎の干渉情報のそれぞれに付加されていた無線端末２Ｂの識別情報に基づいて、送信電力の制御対象となる無線端末２Ｂを特定する。次に、無線端末送信電力制御部１６２は、当該干渉情報に付加されていたリソースブロックの識別情報を含み、且つ、当該干渉情報の値が大きいほど、送信電力の低下率が大きくなるような送信電力の低下要求を生成する。   Further, the radio terminal transmission power control unit 162 controls the transmission power of the radio terminal 2B based on the interference information for each resource block (interference information after correction when corrected). Specifically, the wireless terminal transmission power control unit 162 controls transmission power based on the identification information of the wireless terminal 2B received by the reception processing unit 160 and added to the interference information for each resource block. The target wireless terminal 2B is specified. Next, the radio terminal transmission power control unit 162 includes the identification information of the resource block added to the interference information, and the transmission power decrease rate increases as the value of the interference information increases. Generate a power reduction request.

更に、無線端末送信電力制御部１６２は、生成した送信電力の低下要求を、無線通信部１１５及びアンテナ部１１７を介して、無線端末２Ｂへ送信する。無線端末２Ｂは、この送信電力の低下要求を受信すると、当該送信電力の低下要求に付加されていたリソースブロックの識別情報に対応するリソースブロックについて、送信電力を低下させる。   Further, the wireless terminal transmission power control unit 162 transmits the generated transmission power reduction request to the wireless terminal 2B via the wireless communication unit 115 and the antenna unit 117. When receiving the transmission power reduction request, the wireless terminal 2B reduces the transmission power for the resource block corresponding to the resource block identification information added to the transmission power reduction request.

（２）無線基地局の動作
（２．１）第１無線基地局１Ａの動作
図４は、第１無線基地局１Ａの動作を示すフローチャートである。ステップＳ１０１において、無線通信部１０５内の干渉電力測定部１５０は、無線端末２Ａから第１上りリンクを用いて送信される無線信号を受信している間に、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号によって受ける干渉の電力を、無線端末２Ａに割り当てられたリソースブロック毎に測定する。 (2) Operation of Radio Base Station (2.1) Operation of First Radio Base Station 1A FIG. 4 is a flowchart showing the operation of the first radio base station 1A. In step S101, the interference power measurement unit 150 in the radio communication unit 105 receives a radio signal transmitted from the radio terminal 2A using the first uplink, while receiving a radio signal from the radio terminal 2B. The power of interference received by the radio signal transmitted to the 1B using the second uplink is measured for each resource block allocated to the radio terminal 2A.

ステップＳ１０２において、制御部１０２内の通信負荷測定部１５２は、第１無線基地局１Ａにおける処理可能な最大のトラフィック量に対する、実際のトラフィック量の比率（トラフィック量比率）を算出する。   In step S102, the communication load measuring unit 152 in the control unit 102 calculates the ratio of the actual traffic volume (traffic volume ratio) to the maximum traffic volume that can be processed in the first radio base station 1A.

ステップＳ１０３において、制御部１０２内の干渉情報生成部１５４は、各リソースブロック毎の干渉電力値のそれぞれに対応する、リソースブロック毎の干渉情報を生成する。   In step S103, the interference information generation unit 154 in the control unit 102 generates interference information for each resource block corresponding to each interference power value for each resource block.

ステップＳ１０４において、制御部１０２内の送信処理部１５６は、第２無線基地局１Ｂへリソースブロック毎の干渉情報と、トラフィック量比率を示す情報（負荷情報）とを送信する。   In step S104, the transmission processing unit 156 in the control unit 102 transmits interference information for each resource block and information (load information) indicating a traffic volume ratio to the second radio base station 1B.

（２．２）第２無線基地局１Ｂの動作
図５は、第２無線基地局１Ｂの動作を示すフローチャートである。ステップＳ２０１において、制御部１１２内の受信処理部１６０は、第１無線基地局１Ａからのリソースブロック毎の干渉情報と、トラフィック量比率を示す情報とを受信する。 (2.2) Operation of Second Radio Base Station 1B FIG. 5 is a flowchart showing the operation of the second radio base station 1B. In step S201, the reception processing unit 160 in the control unit 112 receives interference information for each resource block from the first radio base station 1A and information indicating a traffic amount ratio.

ステップＳ２０２において、制御部１１２内の無線端末送信電力制御部１６２は、受信されたトラフィック量比率を示す情報に基づいて、同様に受信されたリソースブロック毎の干渉情報を補正する。   In step S202, the radio terminal transmission power control unit 162 in the control unit 112 similarly corrects the received interference information for each resource block based on the received information indicating the traffic volume ratio.

ステップＳ２０３において、制御部１１２内の無線端末送信電力制御部１６２は、干渉情報（補正された場合には補正後の干渉情報）に基づいて、無線端末２Ｂの送信電力を制御する。   In step S203, the wireless terminal transmission power control unit 162 in the control unit 112 controls the transmission power of the wireless terminal 2B based on the interference information (or corrected interference information when corrected).

（３）作用・効果
本実施形態における無線通信システム１０では、第１無線基地局１Ａは、無線端末２Ｂから第２無線基地局１Ｂへ第２上りリンクを用いて送信される無線信号によって受ける干渉の電力を、無線端末２Ａに割り当てられた１又は複数のリソースブロック毎に測定するとともに、第１無線基地局１Ａにおけるトラフィック量比率を算出する。更に、第１無線基地局１Ａは、リソースブロック毎の干渉電力値に対応する、リソースブロック毎の干渉情報を生成し、当該リソースブロック毎の干渉情報と、通信負荷測定部１５２によって測定されたトラフィック量比率を示す情報とを、第２無線基地局１Ｂへ送信する。 (3) Operation / Effect In the radio communication system 10 according to the present embodiment, the first radio base station 1A interferes with a radio signal transmitted from the radio terminal 2B to the second radio base station 1B using the second uplink. Is measured for each of one or a plurality of resource blocks allocated to the radio terminal 2A, and the traffic amount ratio in the first radio base station 1A is calculated. Further, the first radio base station 1A generates interference information for each resource block corresponding to the interference power value for each resource block, and the interference information for each resource block and the traffic measured by the communication load measuring unit 152 Information indicating the quantity ratio is transmitted to the second radio base station 1B.

また、本実施形態における無線通信システム１０では、第２無線基地局１Ｂは、第１無線基地局１Ａからのリソースブロック毎の干渉情報と、トラフィック量比率を示す情報とを受信する。次に、第２無線基地局１Ｂは、受信したトラフィック量比率に基づいて、同様に受信したリソースブロック毎の干渉情報を補正する。更に、第２無線基地局１Ｂは、補正後のリソースブロック毎の干渉情報に基づいて、無線端末２Ｂの送信電力を制御する。   In the radio communication system 10 according to the present embodiment, the second radio base station 1B receives the interference information for each resource block from the first radio base station 1A and information indicating the traffic amount ratio. Next, the second radio base station 1B corrects similarly received interference information for each resource block based on the received traffic volume ratio. Furthermore, the second radio base station 1B controls the transmission power of the radio terminal 2B based on the corrected interference information for each resource block.

第１無線基地局１Ａにおける無線通信の負荷が小さい場合には、干渉の発生源である無線端末２Ｂにおける送信電力を低下させなくても、無線端末２Ａに割り当てるリソースブロックを変更すること等によって、干渉を回避することは可能である。従って、無線端末２Ｂにおける送信電力が、第１無線基地局１Ａにおける干渉電力のみならず、無線通信の負荷をも考慮された状態で制御されることにより、無線端末２Ｂにおいて送信電力が低下することによる無線通信システム１０全体の通信容量の低下を防止することが可能となる。 When the load of wireless communication in the first wireless base station 1A is small, by changing the resource block allocated to the wireless terminal 2A without reducing the transmission power in the wireless terminal 2B that is the source of interference, It is possible to avoid interference. Therefore, the transmission power in the radio terminal 2B is reduced by controlling the transmission power in the radio terminal 2B in consideration of not only the interference power in the first radio base station 1A but also the load of radio communication. Therefore, it is possible to prevent the communication capacity of the entire wireless communication system 10 from being reduced.

（４）その他の実施形態
上記のように、本発明は実施形態によって記載したが、この開示の一部をなす論述及び図面はこの発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施形態、実施例及び運用技術が明らかとなる。 (4) Other Embodiments As described above, the present invention has been described according to the embodiment. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

上述した実施形態では、リソースブロック毎の干渉電力値が大きいほど、対応するリソースブロック毎の干渉情報の値が大きくなったが、干渉情報は、干渉が大きいことを示す「１」と、干渉が小さいことを示す「０」との２値の情報であってもよい。この場合、第１無線基地局１Ａにおける制御部１０２内の干渉情報生成部１５４は、リソースブロック毎の干渉電力値のそれぞれについて、当該干渉電力値が第２の閾値以上である場合には、干渉が大きいことを示す「１」を干渉情報として生成し、当該干渉電力値が第１の閾値未満である場合には、干渉が小さいことを示す「０」を干渉情報として生成する。   In the above-described embodiment, the larger the interference power value for each resource block, the larger the value of the interference information for each corresponding resource block. However, the interference information indicates that the interference is “1” indicating that the interference is large. It may be binary information with “0” indicating smallness. In this case, the interference information generation unit 154 in the control unit 102 in the first radio base station 1A has interference for each of the interference power values for each resource block when the interference power value is equal to or greater than the second threshold value. Is generated as interference information. When the interference power value is less than the first threshold, “0” indicating that the interference is small is generated as interference information.

一方、第２無線基地局１Ｂにおける制御部１１２内の無線端末送信電力制御部１６２は、トラフィック量比率が第１の閾値以上であって、且つ、干渉情報が「１」である場合には、干渉情報の値を「０」に補正する。更に、無線端末送信電力制御部１６２は、干渉情報の値が「１」の場合には、送信電力の低下要求を生成し、無線端末２Ｂへ送信する。   On the other hand, the radio terminal transmission power control unit 162 in the control unit 112 in the second radio base station 1B has a traffic volume ratio equal to or higher than the first threshold and the interference information is “1”. The value of the interference information is corrected to “0”. Furthermore, when the value of the interference information is “1”, the wireless terminal transmission power control unit 162 generates a transmission power reduction request and transmits it to the wireless terminal 2B.

あるいは、干渉情報が３値以上の値であって、干渉電力値が大きいほど、値が大きくなるものであってもよい。この場合、第２無線基地局１Ｂにおける制御部１１２内の無線端末送信電力制御部１６２は、トラフィック量比率が第１の閾値以上であって、且つ、干渉情報が「１」以上である場合には、干渉情報の値を１だけ下げる。更に、無線端末送信電力制御部１６２は、干渉情報の値が大きいほど、送信電力の低下率が大きくなるような送信電力の低下要求を生成し、無線端末２Ｂへ送信する。   Alternatively, the interference information may be three or more values, and the value may be larger as the interference power value is larger. In this case, the radio terminal transmission power control unit 162 in the control unit 112 in the second radio base station 1B determines that the traffic volume ratio is greater than or equal to the first threshold and the interference information is greater than or equal to “1”. Lowers the value of interference information by one. Further, the wireless terminal transmission power control unit 162 generates a transmission power reduction request such that the reduction rate of the transmission power increases as the interference information value increases, and transmits the transmission power reduction request to the wireless terminal 2B.

また、上述した実施形態では、第１無線基地局１Ａは、リソースブロック毎に干渉電力を測定し、更に、干渉情報を生成、送信したが、無線端末２Ａに割り当てられた全てのリソースブロックの干渉電力の平均値を算出し、当該干渉電力の平均値に対応する１つの干渉情報を生成、送信するようにしてもよい。この場合、第２無線基地局１Ｂは、１つの干渉情報、換言すれば、無線端末２Ａに割り当てられた全てのリソースブロックに対応する干渉情報に基づいて、無線端末２Ｂの送信電力を制御する。   In the embodiment described above, the first radio base station 1A measures the interference power for each resource block, and further generates and transmits interference information. However, the interference of all resource blocks allocated to the radio terminal 2A An average value of power may be calculated, and one piece of interference information corresponding to the average value of the interference power may be generated and transmitted. In this case, the second radio base station 1B controls the transmission power of the radio terminal 2B based on one piece of interference information, in other words, interference information corresponding to all resource blocks allocated to the radio terminal 2A.

また、無線通信の負荷は、第１無線基地局１Ａにおけるトラフィック量比率に限定されず、第１無線基地局１Ａにおけるリソースブロックの使用率、第１無線基地局１Ａにおけるトラフィック量そのもの、第１無線基地局１Ａにおける無線通信に伴う処理の負荷等であってもよい。   Further, the load of the radio communication is not limited to the traffic volume ratio in the first radio base station 1A, the resource block usage rate in the first radio base station 1A, the traffic volume itself in the first radio base station 1A, the first radio It may be a processing load associated with wireless communication in the base station 1A.

また、上述した実施形態では、無線通信システム１０は、LTE Release 9やLTE-Advancedに基づく構成であったが、他の通信規格に基づく構成であってもよい。   In the above-described embodiment, the wireless communication system 10 has a configuration based on LTE Release 9 or LTE-Advanced, but may have a configuration based on other communication standards.

このように本発明は、ここでは記載していない様々な実施形態等を包含するということを理解すべきである。したがって、本発明はこの開示から妥当な特許請求の範囲の発明特定事項によってのみ限定されるものである。   Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

本発明の無線基地局及び通信制御方法は、無線通信システム全体の通信容量の低下を防止することが可能であり、無線基地局及び通信制御方法として有用である。   The radio base station and the communication control method of the present invention can prevent a decrease in communication capacity of the entire radio communication system, and are useful as a radio base station and a communication control method.

１Ａ…第１無線基地局、１Ｂ…第２無線基地局、２Ａ、２Ｂ…無線端末、３Ａ、３Ｂ…セル、１０２、１１２…制御部、１０３、１１３…記憶部、１０４、１１４…有線通信部、１０５、１１５…無線通信部、１０７、１１７…アンテナ部、１５０…干渉電力測定部、１５２…通信負荷測定部、１５４…干渉情報生成部、１５６…送信処理部、１６０…受信処理部、１６２…無線端末送信電力制御部   DESCRIPTION OF SYMBOLS 1A ... 1st wireless base station, 1B ... 2nd wireless base station, 2A, 2B ... Wireless terminal, 3A, 3B ... Cell, 102, 112 ... Control part, 103, 113 ... Storage part, 104, 114 ... Wired communication part , 105, 115 ... wireless communication unit, 107, 117 ... antenna unit, 150 ... interference power measurement unit, 152 ... communication load measurement unit, 154 ... interference information generation unit, 156 ... transmission processing unit, 160 ... reception processing unit, 162 ... Radio terminal transmission power control unit

Claims (8)

接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局であって、
前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信する受信部と、
前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて、前記無線端末の送信電力を制御する送信電力制御部と
を備える無線基地局。 A radio base station that controls interference that a connected radio terminal gives to another radio base station based on interference information that is information related to interference power received by the other radio base station,
A receiver that receives the interference information from the other radio base station, and load information indicating a load of radio communication in the other radio base station from the other radio base station;
A transmission power control unit that corrects the interference information received by the reception unit according to the load information received by the reception unit, and controls transmission power of the wireless terminal based on the corrected interference information; A wireless base station comprising: 前記送信電力制御部は、前記干渉情報について、前記負荷情報によって示される前記無線通信の負荷が小さいほど、干渉電力が小さいことを示すように補正し、補正した干渉情報に基づいて、前記無線端末の送信電力を制御する請求項１に記載の無線基地局。   The transmission power control unit corrects the interference information to indicate that the interference power is smaller as the load of the wireless communication indicated by the load information is smaller, and based on the corrected interference information, the wireless terminal The radio base station according to claim 1, wherein the transmission power is controlled. 前記送信電力制御部は、前記負荷情報によって示される前記無線通信の負荷を示す値が所定の閾値以下である場合に、前記干渉情報を、実際の干渉電力よりも低い干渉電力を示すように補正し、補正した干渉情報に基づいて、前記無線端末の送信電力を制御する請求項２に記載の無線基地局。   The transmission power control unit corrects the interference information to indicate interference power lower than actual interference power when a value indicating the load of the wireless communication indicated by the load information is equal to or less than a predetermined threshold. The radio base station according to claim 2, wherein transmission power of the radio terminal is controlled based on the corrected interference information. 前記干渉情報は、所定の周波数帯域の無線リソースにおける干渉電力を示す請求項１乃至３の何れかに記載の無線基地局。   The radio base station according to claim 1, wherein the interference information indicates interference power in a radio resource in a predetermined frequency band. 前記干渉情報は、前記他の無線基地局に接続している他の無線端末に割り当てられた無線リソースにおける最小割り当て単位毎の干渉電力を示す請求項４に記載の無線基地局。   The radio base station according to claim 4, wherein the interference information indicates interference power for each minimum allocation unit in radio resources allocated to other radio terminals connected to the other radio base station. 接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局における通信制御方法であって、
前記無線基地局が、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信するステップと、
前記無線基地局が、前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて前記無線端末の送信電力を制御するステップと
を備える通信制御方法。 A communication control method in a radio base station that controls interference caused by a connected radio terminal to another radio base station based on interference information that is information related to interference power received by the other radio base station. ,
The radio base station receiving the interference information from the other radio base station and load information indicating a load of radio communication in the other radio base station from the other radio base station;
The radio base station corrects the interference information received by the receiving unit according to the load information received by the receiving unit, and controls transmission power of the radio terminal based on the corrected interference information A communication control method comprising the steps. 接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局であって、
前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信する受信部と、
前記受信部により受信された前記負荷情報に応じて、前記受信部により受信された前記干渉情報を補正し、補正した干渉情報に基づいて前記無線端末の送信電力の大きさを制御する送信電力制御部と
を備える無線基地局。 A radio base station that controls interference that a connected radio terminal gives to another radio base station based on interference information that is information related to interference power received by the other radio base station,
A receiver that receives the interference information from the other radio base station, and load information indicating a load of radio communication in the other radio base station from the other radio base station;
Transmission power control for correcting the interference information received by the receiving unit according to the load information received by the receiving unit and controlling the magnitude of the transmission power of the wireless terminal based on the corrected interference information And a radio base station. 接続している無線端末が他の無線基地局に与える干渉を、前記他の無線基地局が受ける干渉電力に関連する情報である干渉情報に基づいて制御する無線基地局における通信制御方法であって、
前記無線基地局が、前記他の無線基地局からの前記干渉情報と、前記他の無線基地局からの前記他の無線基地局における無線通信の負荷を示す負荷情報とを受信するステップと、
前記無線基地局が、受信された前記負荷情報に応じて、受信された前記干渉情報を補正し、補正した干渉情報に基づいて、前記無線端末の送信電力の大きさを制御するステップと
を備える通信制御方法。 A communication control method in a radio base station that controls interference caused by a connected radio terminal to another radio base station based on interference information that is information related to interference power received by the other radio base station. ,
The radio base station receiving the interference information from the other radio base station and load information indicating a load of radio communication in the other radio base station from the other radio base station;
The wireless base station corrects the received interference information according to the received load information, and controls the magnitude of transmission power of the wireless terminal based on the corrected interference information. Communication control method.
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